 Van
Air EMD Series cycling refrigerated compressed air dryers
provide a consistent dew point when running at less than the
design capacity. Since the actual energy cost is directly
related to the amount of air dried, energy savings is maximized.
For example, in a pneumatic system designed to dry 1000 SCFM,
a cycling refrigerated air dryer running at 75% of the design
capacity would save approximately $1,000 per year in electrical
energy costs versus a non-cycling dryer. At 50% of design
capacity, the savings would increase to $2,000 per year.
EMD
Series cycling refrigerated compressed air dryers use direct
expansion cooling to prevent dew point spikes, an inherent
problem for competitive models using a thermal mass design.
In thermal mass dryers, a refrigerant is used to cool a
mass. This mass is then used to cool the compressed air.
The time required to cool the mass delays cooling of the
compressed air, resulting in dew point spikes up to 60°
F that last 30 minutes or longer. These dew point spikes
allow for extensive moisture carryover throughout the system.
In contrast,
the Van Air cycling refrigerated dryer maintains a constant
dew point temperature which helps eliminate moisture carryover.
The constant dew point temperature provided by our EMD Series
cycling refrigerated air dryers can be achieved because
of its unique flooded evaporator design. Unlike competitive
thermal mass dryers, we display a digital readout of the
air dew point temperature on the cycling refrigerated dryer
and issue a written guarantee of dew point performance.
Standard
units are available from 80 through 8,000 SCFM. Custom units
are available up to 25,000 SCFM. The capacity of the EMD
Series cycling refrigerated compressed air dryer is based
on operating conditions of 100° F inlet air temperature,
100° F ambient temperature and 100 PSIG operating pressure.
Dryers rated for higher pressures or other operating conditions
are available.
| Benefits
of the EMD Air Dryer |
•
Cycling refrigeration compressor results in maximum energy
savings
Savings
are directly related to the amount of air dried. A Model
EMD-1250 running at 75% or design capacity will save $1,100
per year in electrical energy costs versus a non-cycling
unit. The savings increase to $2,200 per year if the air
dryer is operating at 50% of design capacity.
• Continuous Dew Point Temperature Readout
The
EMD PLUS Series dryers display the precise dew point temperature
on the control panel to allow easy monitoring of dryer performance.
• Direct Expansion Cooling Prevents Dew Point Spikes
Refrigerant
directly cools the compressed air. In contrast, thermal
mass type dryers and other competitive models inefficiently
use refrigerant to cool a mass, which in turn cools the
compressed air. The time required to cool the media delays
cooling of the compressed air, resulting in dew point spikes
up to 60°
F that last 30 minutes or longer, allowing extensive moisture
carryover.
When glycol or sand absorb heat, there is no latent heat
involved. Therefore, the temperature and dew point must
rise. The EMD maintains a constant dew point temperature
because of its unique flooded evaporator design.
EMD
Series Dimensions and Specifications - Inches and
Pounds |
 |
| Model
|
A
|
B
|
C
|
Inlet
/ Outlet |
Nominal
Compressor
(HP) |
Weight
|
|
EMD-40 |
23 |
15 |
34 |
1 NPT(m) |
1/3
|
170 |
|
EMD-60 |
23 |
15 |
34 |
1 NPT(m) |
1/2
|
186 |
|
EMD-80 |
32 |
20 |
35 |
1 NPT(m) |
1/2
|
224 |
|
EMD-100 |
32 |
20 |
35 |
1 1/2 NPT(m) |
3/4
|
241 |
|
EMD-130 |
32 |
20 |
35 |
1 1/2 NPT(m) |
3/4
|
265 |
|
EMD-165 |
32 |
20 |
35 |
1 1/2 NPT(m) |
3/4
|
265 |
|
EMD-220 |
38 |
22 |
47 |
2 NPT(m) |
1 |
390 |
|
EMD-260 |
42 1/2 |
21 1/2 |
50 3/4 |
2 NPT(m) |
1 1/2 |
418 |
|
EMD-330 |
57 |
59 |
27 1/2 |
2 NPT(m) |
1 1/2 |
712 |
|
EMD-400 |
57 |
60 |
27 1/2 |
2 1/2 NPT(m) |
2 |
924 |
|
EMD-520 |
57 |
60 |
27 1/2 |
2 1/2 NPT(m) |
3 |
968 |
|
EMD-650 |
57 |
60 |
27 1/2 |
2 1/2 NPT(m) |
3 |
840 |
|
EMD-820 |
64 1/4 |
74 |
41 1/2 |
3 FLG |
4 |
1625 |
|
EMD-1050 |
64 1/4 |
74 |
41 1/2 |
3 FLG |
5 |
1800 |
|
EMD-1250 |
64 |
74 |
41 1/2 |
3 FLG |
5 |
1850 |
|
EMD-1600 |
65 |
78 |
48 |
4 FLG |
7 1/2 |
2130 |
|
| |
 |
| Model |
A |
B |
C |
Inlet
/ Outlet |
Nominal
Compressor
(HP) |
Heat
Rejection
(BTUs / Hr) |
Weight |
|
EMD-2050 |
66 |
105 |
54 |
6 FLG |
10 |
150,000 |
2800 |
|
EMD-2500 |
66 |
105 |
54 |
6 FLG |
15 |
225,000 |
3300 |
|
EMD-3080 |
77 |
102 |
62 |
6 FLG |
15 |
225,000 |
4310 |
|
EMD-4450 |
77 |
114 |
66 |
8 FLG |
20 |
300,000 |
5100 |
|
EMD-5000 |
76 |
144 |
72 |
8 FLG |
25 |
375,000 |
7230 |
|
EMD-6250 |
78 |
144 |
72 |
8 FLG |
30 |
450,000 |
8800 |
|
EMD-8000 |
84 |
144 |
84 |
10 FLG |
40 |
600,000 |
9800 |
|
EMD-10,000 |
96 |
144 |
84 |
10 FLG |
50 |
750,000 |
10,900 |
|
EMD-12,000 |
84 |
172 |
72 |
12 FLG |
(2) 30 |
900,000 |
13,600 |
|
EMD-15,000 |
96 |
144 |
94 |
12 FLG |
(2) 40 |
1,200,000 |
16,000 |
|
EMD-20,000 |
96 |
144 |
94 |
14 FLG |
2 (50) |
1,500,000 |
20,300 |
|
EMD-25,000 |
112 |
162 |
162 |
16 FLG |
2 (60) |
1,800,000 |
23,400 |
|
| |
| Correction
Factors |
| If
any conditions vary from the standard of 100 PSIG,
100° F inlet temperature or 100° F ambient,
use the listed correction factors against the standard
flow. |
Example
EMD-1050 PLUS corrected for 125 PSIG, 120° F inlet
temperature and 110° ambient = Standard capacity
x (A) x (B) x (C) = 1050 x 1.02 x .75 x .9 = 723 SCFM
revised capacity. |
(A)
Working
Pressure |
Correction
Factor |
| 50
PSIG |
.8 |
| 75
PSIG |
.9 |
| 90
PSIG |
.95 |
| 100
PSIG |
1 |
| 110
PSIG |
1.01 |
| 125
PSIG |
1.02 |
| 150
PSIG |
1.05 |
|
(B)
Inlet
Temperature |
Correction
Factor |
| 90°
F |
1.2 |
| 100°
F |
1 |
| 120°
F |
.75 |
| 140°
F |
.6 |
| 160°
F |
.52 |
|
(C)
Ambient
Temperature |
Correction
Factor |
| 90°
F |
1.05 |
| 100°
F |
1 |
| 110°
F |
.9 |
|
|
|
|
